Specification: Battery Type: Panasonic/Sanyo Li-ion Voltage: 18V Battery Capacity: 3000mAh Item Weight: 318g per Battery Replace the following battery models: Yard Force 1920726 Suitable for the device models: (Please search with "Ctrl + F") Yard Force AMIRO 350 AMIRO 350i AMIRO 400 AMIRO 400i Compact 400Ri Note: Please don't store the batteries for a long time, it need to be used at least once a month. If it’s necessary, please using a cotton swab with alcohol to clean the battery contacts. After long-time using in your power tools, please fully rest the batteries. Before recharging the batteries, please make sure that the batteries have already cooled down. For safe transportation, the batteries have not been full charged, after three cycles.